Method of manufacturing package structure

ABSTRACT

A method of manufacturing a package structure includes: forming a backside RDL structure on a carrier; forming TIVs on the backside RDL structure; mounting at least one passive device on the backside RDL structure, so that the at least one passive device is disposed between the TIVs; placing a die on the at least one passive device, so that the at least one passive device is vertically sandwiched between the die and the backside RDL structure; forming an encapsulant laterally encapsulating the die, the TIVs, and the at least one passive device; forming a front side RDL structure on a front side of the die, the TIVs, and the encapsulant; releasing the backside RDL structure from the carrier; and mounting a package on the backside RDL structure, wherein the package is electrically connected to the at least one passive device by conductive connectors and solders.

CROSS-REFERENCE TO RELATED APPLICATION

This is a continuation application of and claims the priority benefit of U.S. application Ser. No. 17/030,409, filed on Sep. 24, 2020, now allowed. The U.S. application Ser. No. 17/030,409 is a continuation application of and claims the priority benefit of U.S. application Ser. No. 16/218,492, filed on Dec. 13, 2018, now U.S. Pat. No. 10,811,404, issued on Oct. 20, 2020, and claims the priority benefit of U.S. provisional application Ser. No. 62/678,274, filed on May 31, 2018. The entirety of each of the above-mentioned patent applications is hereby incorporated by reference herein and made a part of this specification.

BACKGROUND

A Power Distribution Network (hereinafter “PDN”) delivers power and ground voltages from pad locations to all devices in an integrated circuit (hereinafter “IC”). With the continuous improvement of manufacturing the IC device technology, the portable electronic products require greater functionalities, higher performances, and lower costs in smaller and lighter formats. These requirements have been partly satisfied through major advances in the IC device technology and by the introduction of smaller packaging form factors, smaller discrete passive components, and high-density interconnection technologies. In the case, integrated passive devices (IPD) are becoming increasingly popular for their compactness.

However, there is still a need for improving the current IPD integration to meet various needs.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A to FIG. 1I are schematic cross-sectional views illustrating a method of manufacturing a package structure according to a first embodiment of the disclosure.

FIG. 2A to FIG. 2I are schematic cross-sectional views illustrating a method of manufacturing a package structure according to a second embodiment of the disclosure.

FIG. 2J is a top view of line A-A′ of FIG. 2I.

FIG. 3A is schematic cross-sectional view illustrating a package structure according to a third embodiment of the disclosure.

FIG. 3B is a top view of line B-B′ of FIG. 3A.

FIG. 4A is schematic cross-sectional view illustrating a package structure according to a fourth embodiment of the disclosure.

FIG. 4B is a top view of line C-C′ of FIG. 4A.

FIG. 5A to FIG. 5J are schematic cross-sectional views illustrating a method of manufacturing a package structure according to a fifth embodiment of the disclosure.

FIG. 6A to FIG. 6J are schematic cross-sectional views illustrating a method of manufacturing a package structure according to a sixth embodiment of the disclosure.

FIG. 7A to FIG. 7K are schematic cross-sectional views illustrating a method of manufacturing a package structure according to a seventh embodiment of the disclosure.

FIG. 8A to FIG. 8L are schematic cross-sectional views illustrating a method of manufacturing a package structure according to an eighth embodiment of the disclosure.

FIG. 9A to FIG. 9J are schematic cross-sectional views illustrating a method of manufacturing a package structure according to a ninth embodiment of the disclosure.

FIG. 10 is schematic cross-sectional view illustrating a package structure according to a tenth embodiment of the disclosure.

DETAILED DESCRIPTION

The following disclosure provides many different embodiments, or examples, for implementing different features of the provided subject matter. Specific examples of components and arrangements are described below to simplify the present disclosure. These are, of course, merely examples and are not intended to be limiting. For example, the formation of a second feature over or on a first feature in the description that follows may include embodiments in which the second and first features are formed in direct contact, and may also include embodiments in which additional features may be formed between the second and first features, such that the second and first features may not be in direct contact. In addition, the present disclosure may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.

Further, spatially relative terms, such as “beneath”, “below”, “lower”, “on”, “above”, “upper” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the FIG.s. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the FIG.s. The apparatus may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein may likewise be interpreted accordingly.

Other features and processes may also be included. For example, testing structures may be included to aid in the verification testing of the 3D packaging or 3DIC devices. The testing structures may include, for example, test pads formed in a redistribution layer or on a substrate that allows the testing of the 3D packaging or 3DIC, the use of probes and/or probe cards, and the like. The verification testing may be performed on intermediate structures as well as the final structure. Additionally, the structures and methods disclosed herein may be used in conjunction with testing methodologies that incorporate intermediate verification of known good dies to increase the yield and decrease costs.

FIG. 1A to FIG. 1I are schematic cross-sectional views illustrating a method of manufacturing a package structure according to a first embodiment of the disclosure.

Referring to FIG. 1A, a carrier C having a de-bonding layer DB and a dielectric layer DI formed thereon is provided, wherein the de-bonding layer DB is formed between the carrier C and the dielectric layer DI. In some embodiments, the carrier C is a glass substrate, the de-bonding layer DB is a light-to-heat conversion (LTHC) release layer formed on the glass substrate, and the dielectric layer DI is a photosensitive polybenzoxazole (PBO) or polyimide (PI) layer formed on the de-bonding layer DB, for example. In alternative embodiments, the de-bonding layer DB may be a photo-curable release film whose viscosity is decreased by photo-curing process or a thermal curable release film whose viscosity is decreased by thermal-curing process, and the dielectric layer DI may be made from other photosensitive or non-photosensitive dielectric materials.

Referring to FIG. 1B, a redistribution layer (RDL) structure 102 is formed on the dielectric layer DI. In detail, the RDL structure 102 may include a plurality of conductive features 104 embedded in a dielectric layer 106. The dielectric layer 106 may be a single layer or a multilayer structure, for example. In some embodiments, a material of the dielectric layer 106 includes an inorganic dielectric material, an organic dielectric material, or a combination thereof. The inorganic dielectric material is, for example, silicon oxide, silicon nitride, silicon oxynitride, or a combination thereof. The organic dielectric material may include polymer. The polymer includes a photosensitive material, a non-photosensitive material, or a combination thereof. In some embodiments, the photosensitive material includes polybenzoxazole (PBO), polyimide, benzocyclobutene (BCB), positive photoresist, negative photoresist, a combination thereof, and/or the like. The non-photosensitive material includes Ajinomoto buildup film (ABF). The dielectric layer 106 may be formed by chemical vapor deposition, spin coating, or lamination.

In some embodiments, the conductive features 104 includes a plurality of traces and vias (not shown) stacked alternately. The conductive features 104 is formed by following steps including forming a seed layer (not shown) on the dielectric layer DI by a CVD process or a PVD process (e.g., sputtering), forming a photoresist pattern (not shown) with a plurality of openings on the seed layer, forming a conductive material (not shown) in the openings by a plating process, and removing the photoresist pattern and the seed layer covered by the photoresist pattern. In the case, the conductive features 104 may include the conductive material and underlying seed layer. In some embodiments, the conductive features 104 may be made of conductive materials with low resistivity, such as copper (Cu), aluminum (Al), Cu alloys, Al alloys, or other suitable materials.

Although only one RDL structure 102 is illustrated in FIG. 1B, the embodiments of the present invention are not limited thereto. In some embodiments, one or more RDL structures are formed on the dielectric layer DI. That is, one or more dielectric layers and conductive features formed in the one or more dielectric layers are included in the RDL structure 102. However, the layout or the arrangement of the RDL structures is not limited by the embodiments described herein.

In FIG. 1B, after the RDL structure 102 is formed, a plurality of through insulator vias (TIVs) 105 are formed on and electrically connected to the RDL structure 102. In some embodiments, the TIVs 105 are formed by photolithography, plating, and photoresist stripping process. For example, the TIVs 105 include copper posts. The TIVs 105 may be formed by following steps including forming a seed layer (not shown) on the RDL structure 102 by a CVD process or a PVD process (e.g., sputtering), forming a photoresist pattern (not shown) with a plurality of openings on the seed layer, forming a conductive material (not shown) in the openings by a plating process, and removing the photoresist pattern and the seed layer covered by the photoresist pattern. In the case, the TIVs 105 may include the conductive material and underlying seed layer. In some alternative embodiments, the TIVs 105 are obtained by the manufacturer may be mounted on the RDL structure 102.

In FIG. 1B, after the TIVs 105 are formed, a die 100 is picked and placed on the RDL structure 102, so that the die 100 is surrounded by the TIVs 105. In some embodiments, the dies 100 may be or include a logic die, such as a central processing unit (CPU) die, a graphic processing unit (GPU) die, a micro control unit (MCU) die, an input-output (I/O) die, a baseband (BB) die, or an application processor (AP) die. In some embodiments, the die 100 includes a memory die such as high bandwidth memory (HBM) die. Although only one die 100 is illustrated in FIG. 1B, the embodiments of the present invention are not limited thereto. In alternative embodiments, one or more dies are placed on the RDL structure 102.

In detail, the die 100 includes a front side (or an active surface) 100 a and the backside 100 b opposite to each other. Herein, the front side 100 a of the die 100 is referred to as a top surface of a substrate 101. The front side 100 a of the die 100 faces up and the backside 100 b of the die 100 faces forward the RDL structure 102. In some embodiments, the backside 100 b of the die 100 is adhered on the RDL structure 102 through an adhesive layer AD such as a die attach film (DAF), silver paste, or the like. In the case, the backside 100 b of the die 100 is in contact with the adhesive layer AD, so that the adhesive layer AD is disposed between the die 100 and the RDL structure 102.

In FIG. 1B, the die 100 may include the substrate 101, a plurality of contacts 103, and a passivation layer 107. The contacts 103 are formed on the top surface 100 a of the substrate 101. The passivation layer 107 is formed to laterally surround the contacts 103. In some embodiments, the substrate 101 may be made of silicon or other semiconductor materials. Alternatively, or additionally, the substrate 101 may include other elementary semiconductor materials such as germanium. In some embodiments, the substrate 101 is made of a compound semiconductor such as silicon carbide, gallium arsenic, indium arsenide or indium phosphide. In some embodiments, the substrate 101 is made of an alloy semiconductor such as silicon germanium, silicon germanium carbide, gallium arsenic phosphide, or gallium indium phosphide. Furthermore, the substrate 101 may be a semiconductor on insulator such as silicon on insulator (SOI) or silicon on sapphire.

In some embodiments, the contacts 103 may be metal posts, such as copper post or the like. The passivation layer 107 may be a single layer or a multi-layered structure. In some embodiments, the passivation layer 107 includes an inorganic dielectric material, an organic dielectric material, or a combination thereof. The inorganic dielectric material is, for example, silicon oxide, silicon nitride, silicon oxynitride, or a combination thereof. The organic dielectric material may include polymer. The polymer includes polybenzoxazole (PBO), polyimide, benzocyclobutene (BCB), positive photoresist, negative photoresist, a combination thereof, and/or the like.

After the die 100 is placed on the RDL structure 102, an encapsulant 108 is formed to laterally encapsulate the die 100 and the TIVs 105. In some embodiments, the encapsulant 108 includes a molding compound, a molding underfill, a resin (such as an epoxy resin), or a combination thereof, or the like. The encapsulant 108 may be formed by a sequence of an over-molding process and a planarizing process. For example, an encapsulation material (not shown) is formed over the carrier C to fill in the gaps between the die 100 and TIVs 105 and encapsulate the die 100 and the TIVs 105. In addition, the encapsulation material further covers the top surfaces of the die 100 and the TIVs 105. The planarizing process is performed on the encapsulation material until top surfaces 103 t of the contacts 103 and top surfaces 105 t of the TIVs 105 are exposed. In the case, the top surface 103 t of the contacts 103, the top surfaces 105 t of the TIVs 105, and a top surface 108 t of the encapsulant 108 are coplanar after performing the planarizing process. In some embodiments, the planarizing process includes a mechanical grinding process and/or a chemical mechanical polishing (CMP) process.

Referring to FIG. 1C, a RDL structure 132 is formed on the die 100, the TIVs 105 and the encapsulant 108. The RDL structure 132 is electrically connected to the die 100 and the RDL structure 102 through the TIVs 105. In detail, the RDL structure 132 may include a plurality of conductive features 134 embedded in a dielectric layer 136. In some embodiments, the conductive features 134 include a plurality of traces and vias (not shown) stacked alternately. The material and forming method of the conductive features 134 and the dielectric layer 136 are similar to the material and forming method of the conductive features 104 and the dielectric layer 106 illustrated in above embodiments. Thus, details thereof are omitted here.

Herein, the RDL structure 132 is formed on the front side 100 a of the die 100, thus, the RDL structure 132 is referred to as a front side RDL (FSRDL) structure. Similarly, the RDL structure 102 is formed on the backside 100 b of the die 100, thus the RDL structure 102 is referred to as a backside RDL (BSRDL) structure. As shown in FIG. 1C, the die 100 is sandwiched between the BSRDL structure 102 and the FSRDL structure 132.

In FIG. 1C, the conductive features 134 of the RDL structure 132 may include topmost conductive features 134 a and 134 b exposed by the dielectric layer 136. In detail, the topmost conductive features 134 a may be metal posts or metal pads for connecting to a first passive device 110. The topmost conductive features 134 b may be referred as under-ball metallurgy (UBM) layer for mounting a plurality of conductive connectors 138.

After the RDL structure 132 is formed, the first passive device 110 is formed on the RDL structure 132 through the topmost conductive features 134 a and connectors 112. As shown in FIG. 1C, the connectors 112 are micro-bumps containing copper posts 114 and solder caps 116, but the disclosure is not limited thereto, and other conductive structures such as solder bumps, gold bumps or metallic bumps may also be used as the connectors 112. A size of the connector 112 is less than a size of the conductive connectors 138. Herein, the term “size” is referred to the length, width, height, or area. For example, as shown in FIG. 1C, a width and/or a height of the connector 112 is less than a width and/or a height of the conductive connectors 138. In some embodiments, the first passive device 110 may be an integrated passive device (IPD), such as capacitors, resistors, inductors, baluns, couplers, splitters, filters, diplexers, or the like is able to be integrated in the IPD. Although only one first passive device 110 is illustrated in FIG. 1C, the embodiments of the present invention are not limited thereto. In alternative embodiments, one or more passive devices are placed on the RDL structure 132.

After the first passive device 110 is mounted on the RDL structure 132, the conductive connectors 138 (also referred to as conductive balls) are formed on the topmost conductive features 134 b (e.g., the UBM layer). In some embodiments, the conductive connectors 138 are made of a conductive material with low resistivity, such as Sn, Pb, Ag, Cu, Ni, Bi or an alloy thereof, and are formed by a suitable process such as evaporation, plating, ball drop, screen printing, or a ball mounting process.

Referring to FIG. 1C and FIG. 1D, a structure 10 a illustrated in FIG. 1C is flipped and mounted on the frame 140 by the conductive connectors 138. The carrier C and the de-bonding layer DB are detached from the structure 10 a and then removed. In the case, as shown in FIG. 1D, a top surface DIt of the dielectric layer DI is exposed. In some embodiments, the de-bonding layer DB (e.g., the LTHC release layer) is irradiated with a UV laser so that the carrier C and the de-bonding layer DB are easily peeled off from the structure 10 a. Nevertheless, the de-bonding process is not limited thereto, and other suitable de-bonding methods may be used in some alternative embodiments.

Referring to FIG. 1D and FIG. 1E, the dielectric layer DI is patterned to form a plurality of openings 142 and 143. In FIG. 1E, the openings 142 expose one portion of the conductive features 104 of the RDL structure 102, while the openings 143 expose another portion of the conductive features 104 of the RDL structure 102. The openings 143 are directly formed on the backside 100 b of the die 100. The openings 142 are disposed aside the openings 143. In some embodiments, the openings 142 and 143 are formed by a laser drilling process or a photolithography and etching processes. In some alternative embodiments, widths of the openings 142 and 143 are different. In the embodiments, as shown in FIG. 1E, the width of the openings 142 is greater than the width of the openings 143.

Referring to FIGS. 1E and 1F, a plurality of solders 144 are respectively formed in the openings 142 to connect to the one portion of the conductive features 104 exposed by the openings 142. A plurality of solders 145 are respectively formed in the openings 143 to connect to the another portion of the conductive features 104 exposed by the openings 143. In some embodiments, the solders 144 are formed by a solder pasting or printing process, but the disclosure is not limited thereto. In some alternative embodiments, widths of the solders 144 and 145 are different. In the embodiments, as shown in FIG. 1F, the width of the solders 144 is greater than the width of the solders 145.

Referring to FIG. 1G, a second passive device 120 is flipped and mounted on the RDL structure 102 through connectors 122 and the solders 145. In some embodiments, the connectors 122 are micro-bumps containing copper posts 124 and solder caps 126, but the disclosure is not limited thereto, and other conductive structures such as solder bumps, gold bumps or metallic bumps may also be used as the connectors 122. In some embodiments, the second passive device 120 may be an integrated passive device (IPD), such as capacitors, resistors, inductors, baluns, couplers, splitters, filters, diplexers, or the like is able to be integrated in the IPD. In some alternative embodiments, the second passive device 120 and the first passive device 110 may perform the same function or different functions depending on the designer's need. Although only one second passive device 120 is illustrated in FIG. 1G, the embodiments of the present invention are not limited thereto. In alternative embodiments, one or more passive devices are placed on the RDL structure 102. As shown in FIG. 1G, a package 10 b is accomplished.

Referring to FIG. 1H, another package (or upper package) 10 c is bonded to the bottom package 10 b through a plurality of conductive connectors 204 (also referred to as conductive balls) and the solders 144. In detail, the upper package 10 c includes a circuit substrate 202, a first die 200 a, a second die 200 b, and an encapsulant 208. The first die 200 a and the second die 200 b are mounted on the circuit substrate 202 by a flip-chip way or wire-bonding way. In some embodiments, the first die 200 a may be selected from an application-specific integrated circuit (“ASIC”) chip, an analog chip, a sensor chip, a wireless chip, a radio frequency chip, a voltage regulator chip or a memory chip. In some embodiments, the second die 200 b may be selected from an ASIC chip, an analog chip, a sensor chip, a wireless chip, a radio frequency chip, a voltage regulator chip or a memory chip. In certain embodiments, the first die 200 a and the second die 200 b are different types of dies. For example, the first die 200 a and the second die 200 b may encompass different electronic components or elements. Depending on the application, the first die 200 a and the second die 200 b may perform different functions. In some embodiments, the first die 200 a may be a system on chip (SoC) die and the second die 200 b may be a high bandwidth memory (HBM) die. However, the disclosure is not limited thereto, and the first die 200 a and the second die 200 b may be the same type of die, such as the memory die. Although only two dies 200 a and 200 b are illustrated in FIG. 1H, the embodiments of the present invention are not limited thereto. In alternative embodiments, two or more dies are laterally placed on the circuit substrate 202. In other embodiments, the first die 200 a or the second die 200 b may be a die stack structure that includes a plurality of dies stacked alternately on the circuit substrate 202.

In FIG. 1H, the encapsulant 208 are formed on the circuit substrate 202 to encapsulate the first die 200 a and the second die 200 b. In some embodiments, the encapsulant 208 includes a molding compound, a molding underfill, a resin (such as an epoxy resin), or a combination thereof, or the like. The encapsulant 208 may be formed by an over-molding process.

After the upper package 10 c is bonded to the package 10 b, an underfill layer 206 is formed to laterally encapsulate the conductive connectors 204 and the second passive device 120. In some embodiments, the underfill layer 206 may be any acceptable material, such as a polymer, epoxy, molding underfill, or the like. The underfill layer 206 may be formed by a capillary flow process after the upper package 10 c is attached or may be formed by a suitable deposition method before the upper package 10 c is attached. In some embodiments, a width and/or a height of the conductive connector 204 is greater than a width and/or a height of the connector 122.

Referring to FIG. 1H and FIG. 1I, a package structure 10 is accomplished after the frame 140 is removed. In FIG. 1I, the package structure 10 includes the bottom package 10 b and the upper package 10 c being bonded together. In detail, the bottom package 10 b includes the die 100, the TIVs 105 surrounding the die 100, the encapsulant 108 laterally encapsulating the die 100 and the TIVs 105, the FSRDL structure 132 formed on the front side 100 a of the die 100, the BSRDL structure 102 formed on the backside 100 b of the die 100. The upper package 10 c includes the circuit substrate 202, the first die 200 a and the second die 200 b mounted on the circuit substrate 202, and the encapsulant 208 encapsulating the first die 200 a and the second die 200 b. The conductive connectors 204 are included between and electrically connected the BSRDL structure 102 of the bottom package 10 b and the circuit substrate 202 of the upper package 10 c. In addition, the underfill layer 206 are also disposed between the BSRDL structure 102 of the bottom package 10 b and the circuit substrate 202 of the upper package 10 c to encapsulate the second passive device 120 and the conductive connectors 204.

In FIG. 1I, the package structure 10 further includes the first passive device 110 formed on the FSRDL structure 132 (or referred to as a first RDL structure) and the second passive device 120 formed on the BSRDL structure 102 (or referred to as a second RDL structure). The second passive device 120 is disposed between the upper package 10 c and the backside 100 b of the die 100 (or the BSRDL structure 102). The first passive device 110 is electrically connected to the die 100 through the FSRDL structure 132. In addition, the first passive device 110 is electrically connected to the first die 200 a and the second die 200 b through the FSRDL structure 132, the TIVs 105, the BSRDL structure 102, the conductive connectors 204, and the circuit substrate 202. The second passive device 120 is electrically connected to the die 100 through the BSRDL structure 102, the TIVs 105, and the FSRDL structure 132. The second passive device 120 is electrically connected to the first die 200 a and the second die 200 b through the BSRDL structure 102, the conductive connectors 204, and the circuit substrate 202. Although the first passive device 110 and the second passive device 120 are both shown in FIG. 1I, the embodiments of the present invention are not limited thereto. In other embodiments, only second passive device 120 is included in the package structure 10. That is, the first passive device 110 is optional formed on the FSRDL structure 132.

The first passive device 110 and the second passive device 120 are able to supply and absorb short duration variations in load current and filter high frequency noise from power supplies. It should be noted that the second passive device 120 is disposed between the bottom package 10 b and the upper package 10 c, wherein the second passive device 120 is closer to the upper package 10 c than the first passive device 110. Therefore, the equivalent series resistance (ESR) and/or the equivalent series inductance (ESL) between the upper package 10 c and the second passive device 120 are decrease. As a result, the second passive device 120 is able to provide a high quality power distribution network (PDN) and a fast date rate for the high bandwidth memory, such as low power double-data-rate (LPDDR). That is, the package structure 10 with the first passive device 110 and the second passive device 120 is provide stable power supply voltage and/or current for future application processor (AP) memory system.

FIG. 2A to FIG. 2I are schematic cross-sectional views illustrating a method of manufacturing a package structure according to a second embodiment of the disclosure. FIG. 2J is a top view of line A-A′ of FIG. 2I.

Referring to FIG. 2G, a bottom package 20 b of the second embodiment is similar to the bottom package 10 b of the first embodiment. That is, the forming steps of bottom package 20 b are similar to the forming steps of bottom package 10 b illustrated in FIG. 1A to FIG. 1G so similar elements are denoted by the same or similar reference numeral. Thus, details thereof are omitted here. A difference therebetween lies in that a second passive device 220 illustrated in FIG. 2G includes a plurality of through semiconductor vias (TSVs). In the case, the second passive device 220 is referred to as a two-side IPD.

In detail, the second passive device 220 includes a substrate 212, a device region 213, an interconnect structure 214, the TSVs 215, a plurality of pads 216, and a plurality of connectors 218. In the enlarged view of FIG. 2G, the substrate 212 includes a top surface 212 t and a bottom surface 212 b opposite to each other. In some embodiments, the substrate 212 may be made of silicon or other semiconductor materials. Alternatively, or additionally, the substrate 212 may include other elementary semiconductor materials such as germanium. In some embodiments, the substrate 212 is made of a compound semiconductor such as silicon carbide, gallium arsenic, indium arsenide or indium phosphide. In some embodiments, the substrate 212 is made of an alloy semiconductor such as silicon germanium, silicon germanium carbide, gallium arsenic phosphide, or gallium indium phosphide. Furthermore, the substrate 212 may be a semiconductor on insulator such as silicon on insulator (SOI) or silicon on sapphire.

In the enlarged view of FIG. 2G, the device region 213 is formed on the bottom surface 212 b of the substrate 212. In some embodiments, the device regions 213 includes, but not limited, capacitors, resistors, inductors, baluns, couplers, splitters, filters, diplexers, or the like. The interconnect structure 214 is formed on the bottom surface 212 b of the substrate 212, and the device region 213 is disposed between the substrate 212 and the interconnect structure 214. In some embodiments, the interconnect structure 214 includes a plurality of traces and vias (not shown) stacked alternately. The connectors 218 are formed below the interconnect structure 214. In some embodiments, the connectors 218 may be solder joints that includes tin, lead, silver, copper, or a combination thereof. The pads 216 is formed on the top surface 212 t of the substrate 212. The TSVs 215 penetrates through the substrate 212 and the device region 213, so as to electrically connect the interconnect structure 214 and the pad 216.

As shown in FIG. 2G, the second passive device 220 is mounted or bonded on the RDL structure 102 through the solders 145 and the connectors 218. That is, the solders 145 are in contact with the connectors 218 respectively. The device region 213 is face toward the bottom package 20 b. In some embodiments, as shown in FIG. 2G, an orthographic projection of the second passive device 220 projected on a plane 51 extending from the backside 100 b of the die 100 partially overlaps with a region of the die 100. In some alternative embodiments, the orthographic projection of the second passive device 220 projected on the plane 51 extending from the backside 100 b of the die 100 may completely overlaps with the region of the die 100. In some embodiments, a portion of the second passive device 220 is located within the region of the die 100, while another portion of the second passive device 220 is located out of the region of the die 100. In some alternative embodiments, the second passive device 220 is completely located within the region of the die 100 and without extending beyond the region of the die 100.

Referring to FIG. 2H, the another package (or upper package) 20 c is bonded to the bottom package 20 b through the conductive connectors 204. In detail, the conductive connectors 204 includes a plurality of conductive connectors 204 a and a plurality of conductive connectors 204 b. Hereinafter, the conductive connectors 138 are referred to as first conductive connectors 138, the conductive connectors 204 a are referred to as second conductive connectors 204 a, and the conductive connectors 204 b are referred to as third conductive connectors 204 b. The second conductive connectors 204 a are disposed on the pads 216 of the second passive device 220 respectively. Specifically, the second conductive connectors 204 a are sandwiched between the second passive device 220 and the circuit substrate 202. The second passive device 220 is electrically connected to the first die 200 a and the second die 200 b through the second conductive connectors 204 a and the circuit substrate 202. The third conductive connectors 204 b are disposed aside the second passive device 220. The third conductive connectors 204 b are sandwiched between and electrically connected the RDL structure 102 and the circuit substrate 202. The underfill layer 206 is formed to laterally encapsulate the conductive connectors 204 (including 204 a and 204 b) and the second passive device 220. The arrangement and forming method of the upper package 20 c is similar to the arrangement and forming method of the upper package 10 c illustrated in above embodiments. Thus, details thereof are omitted here.

Referring to FIG. 2I and FIG. 2J, a package structure 20 is accomplished after the frame 140 is removed. In some embodiments, as shown in FIG. 2J, a horizontal cross-sectional area A1 of the second conductive connector 204 a is different from a horizontal cross-sectional area A2 of the third conductive connectors 204 b at the same level, such as a plane S2 along line A-A′. In other word, a width W1 of the second conductive connectors 204 a is different from a width W2 of the third conductive connectors 204 b at the same level, such as a plane S2 along line A-A′. In some embodiments, the horizontal cross-sectional area A1 and/or width W1 of the second conductive connectors 204 a is greater than the horizontal cross-sectional area A2 and/or width W2 of the third conductive connectors 204 b at the same level, such as the plane S2 along line A-A′. However, the embodiments of the present invention are not limited thereto. In some alternative embodiments, the horizontal cross-sectional area A1 and/or width W1 of the second conductive connectors 204 a may be equal to or less than the horizontal cross-sectional area A2 and/or width W2 of the third conductive connectors 204 b at another plane over or below the plane S2 along line A-A′. From another perspective, a height H1 of the second conductive connectors 204 a is less than a height H2 of the third conductive connectors 204 b.

FIG. 3A is schematic cross-sectional view illustrating a package structure according to a third embodiment of the disclosure. FIG. 3B is a top view of line B-B′ of FIG. 3A.

Referring to FIG. 3A and FIG. 3B, a package structure 30 of the third embodiment is similar to the package structure 20 of the second embodiment. A difference therebetween lies in that the second passive devices 220 are respectively mounted on the TIVs 105 rather than on the die 100. As shown in FIG. 3A, in some embodiments, an orthographic projection of the second passive device 220 projected on the plane S3 extending from the backside 100 b of the die 100 is positioned out of the region of the die 100. That is, some of the third conductive connectors 204 b are directly formed over the die 100 and the second conductive connectors 204 a are formed aside the third conductive connectors 204 b and directly formed over the TIVs 105.

In some embodiments, as shown in FIG. 3B, a horizontal cross-sectional area A3 and/or width W3 of the second conductive connector 204 a is different from a horizontal cross-sectional area A4 and/or width W4 of the third conductive connector 204 b at the same level, such as a plane S3 along line B-B′. In some embodiments, the horizontal cross-sectional area A3 and/or width W3 of the second conductive connector 204 a is greater than the horizontal cross-sectional area A4 and/or width W4 of the third conductive connector 204 b at the same level, such as a plane S3 along line B-B′. However, the embodiments of the present invention are not limited thereto. In some alternative embodiments, the horizontal cross-sectional area A3 and/or width W3 of the second conductive connector 204 a may be equal to or less than the horizontal cross-sectional area A4 and/or width W4 of the third conductive connector 204 b at another plane over or below the plane S3 along line B-B′.

FIG. 4A is schematic cross-sectional view illustrating a package structure according to a fourth embodiment of the disclosure. FIG. 4B is a top view of line C-C′ of FIG. 4A.

Referring to FIG. 4A and FIG. 4B, a package structure 40 of the fourth embodiment is similar to the package structure 30 of the third embodiment. A difference therebetween lies in that the second passive devices 220 and the third conductive connectors 204 b are directly mounted on and in contact with the TIVs 105. That is, the package structure 40 of the fourth embodiment is free of the RDL or BSRDL structure 102. In some embodiments, there is no conductive connector directly over the die 100, as shown in FIG. 4A. In some alternative embodiments, some conductive connectors (not shown) may be directly disposed over the die 100.

In some embodiments, as shown in FIG. 4B, a horizontal cross-sectional area A5 and/or width W5 of the second conductive connector 204 a is different from a horizontal cross-sectional area A6 and/or width W6 of the third conductive connector 204 b at the same level, such as a plane S4 along line C-C′. In some embodiments, the horizontal cross-sectional area A5 and/or width W5 of the second conductive connector 204 a is greater than the horizontal cross-sectional area A6 and/or width W6 of the third conductive connector 204 b at the same level, such as a plane S4 along line C-C′. However, the embodiments of the present invention are not limited thereto. In some alternative embodiments, the horizontal cross-sectional area A5 and/or width W5 of the second conductive connector 204 a may be equal to or less than the horizontal cross-sectional area A6 and/or width W6 of the third conductive connector 204 b at another plane over or below the plane S4 along line C-C′.

FIG. 5A to FIG. 5J are schematic cross-sectional views illustrating a method of manufacturing a package structure according to a fifth embodiment of the disclosure.

Referring to FIG. 5A, a carrier C having a de-bonding layer DB and a dielectric layer DI formed thereon is provided, wherein the de-bonding layer DB is formed between the carrier C and the dielectric layer DI.

Referring to FIG. 5B, a RDL structure 102 is formed on the dielectric layer DI. A plurality of openings 502 are formed to expose portions of the conductive features 104 of the RDL structure 102 by a laser drilling process or a photolithography and etching processes.

Referring to FIG. 5C, a plurality of TIVs 105 are formed on the RDL structure 102 by photolithography, plating, and photoresist stripping process.

Referring to FIG. 5D, a plurality of solders 504 are respectively formed in the openings 502 by a solder pasting or printing process, but the disclosure is not limited thereto. The solders 504 are in contact with the portions of the conductive features 104 exposed by the openings 502.

Referring to FIG. 5E, the second passive devices 120 are flipped and mounted on the RDL structure 102 through the solders 504 and the connectors 122. An underfill layer 506 is formed to laterally encapsulate the solders 504 and the connectors 122. In some embodiments, the underfill layer 506 may be any acceptable material, such as a polymer, epoxy, molding underfill, or the like.

The underfill layer 506 may be formed by a capillary flow process after the second passive devices 120 are attached or may be formed by a suitable deposition method before second passive devices 120 are attached. Although only two second passive devices 120 illustrated in FIG. 5E, the embodiments of the present invention are not limited thereto. In some embodiments, one or more second passive devices 120 are mounted on the RDL structure 102.

Referring to FIG. 5F, the die 100 is picked and placed on the second passive devices 120. In detail, the die 100 and the second passive devices 120 are adhered together through an adhesive layer AD and in a back-to-back configuration. That is, the backside 100 b of the die 100 faces to the backsides 120 b of the second passive devices 120.

Referring to FIG. 5G, the encapsulant 108 is formed to laterally encapsulate the die 100, the TIVs 105, the second passive devices 120, and the underfill layer 506. The encapsulant 108 may be formed by a sequence of an over-molding process and a planarizing process. The RDL structure 132 is then formed on the die 100, the TIVs 105 and the encapsulant 108. A plurality of conductive connectors 138 are formed on and electrically connected to the RDL structure 132. Optionally, the first passive device 110 is formed on and electrically connected to the RDL structure 132.

Referring to FIG. 5G and FIG. 5H, a structure 50 a illustrated in FIG. 5G is flipped and mounted on the frame 140 by the conductive connectors 138. The carrier C and the de-bonding layer DB are detached from the structure 50 a and then removed. In the case, as shown in FIG. 5H, a top surface DIt of the dielectric layer DI is exposed.

Referring to FIG. 5I, the dielectric layer DI is patterned to form a plurality of openings (not shown) by a laser drilling process or a photolithography and etching processes. A plurality of solders 510 are respectively formed in the openings by a solder pasting, a printing process, or a suitable process.

Referring to FIGS. 5I and 5J, another package (or upper package) 50 c is bonded to a bottom package 50 b (or bottom package) through a plurality of conductive connectors 204 and the solders 510. The arrangement and forming method of the upper package 50 c are similar to the arrangement and forming method of the upper package 10 c illustrated in above embodiments. Thus, details thereof are omitted here. After removing the frame 140, a package structure 50 is accomplished. In FIG. 5J, the second passive devices 120 are closer to the upper package 50 c than the first passive device 110. Therefore, the equivalent series resistance (ESR) and/or the equivalent series inductance (ESL) between the upper package 50 c and the second passive devices 120 are decrease. As a result, the second passive devices 120 are able to provide a high quality power distribution network (PDN) and a fast date rate for the high bandwidth memory, such as low power double-data-rate (LPDDR).

FIG. 6A to FIG. 6J are schematic cross-sectional views illustrating a method of manufacturing a package structure according to a sixth embodiment of the disclosure.

Referring to FIG. 6A, a carrier C having a de-bonding layer DB and a dielectric layer DI formed thereon is provided, wherein the de-bonding layer DB is formed between the carrier C and the dielectric layer DI.

Referring to FIG. 6B, a RDL structure 102 is formed on the dielectric layer DI. A plurality of openings 602 are formed in the dielectric layer 106 of the RDL structure 102 to expose portions of the conductive features 104 of the RDL structure 102 by a laser drilling process or a photolithography and etching processes.

Referring to FIG. 6C, a plurality of solders 604 are respectively formed in the openings 602 by a solder pasting or printing process, but the disclosure is not limited thereto. The solders 604 are in contact with and electrically connected to the portions of the conductive features 104 exposed by the openings 602.

Referring to FIG. 6D, the second passive devices 220 are flipped and mounted on the RDL structure 102 through the solders 604 and the connectors 218. An underfill layer 606 is formed to laterally encapsulate the solders 604 and the connectors 218. In some embodiments, the underfill layer 606 may be any acceptable material, such as a polymer, epoxy, molding underfill, or the like. The underfill layer 606 may be formed by a capillary flow process after the second passive devices 220 are attached or may be formed by a suitable deposition method before second passive devices 220 are attached. Although only two second passive devices 220 illustrated in FIG. 6D, the embodiments of the present invention are not limited thereto. In some embodiments, one or more second passive devices 220 are mounted on the RDL structure 102.

Referring to FIG. 6E, a plurality of TIVs 605 are formed on the RDL structure 102 and the second passive devices 220 by photolithography, plating, and photoresist stripping process. For example, the TIVs 605 include copper posts. In detail, the TIVs 605 includes TIVs 608 and 609. The TIVs 608 are directly formed on and electrically connected to the second passive devices 220, and the TIVs 609 are directly formed on and electrically connected to the RDL structure 102. In the case, the second passive devices 220 are disposed between and electrically connect the TIVs 608 and the RDL structure 102.

Referring to FIG. 6F, the die 100 is picked and placed on the RDL structure 102 through an adhesive layer AD. The TIVs 609 are laterally disposed between the die 100 and the second passive devices 220. In the case, the front side 100 a of the die 100 faces up, while the backside 100 b of the die 100 faces toward the RDL structure 102 and in contact with the adhesive layer AD. In some embodiments, the RDL structure 102 is referred to as a backside RDL (BSRDL) structure.

Referring to FIG. 6F and FIG. 6G, after the die 100 is placed on the RDL structure 102, an encapsulant 108 is formed to laterally encapsulate the die 100 and the TIVs 605. The encapsulant 108 may be formed by a sequence of an over-molding process and a planarizing process. For example, an encapsulation material (not shown) is formed over the carrier C to fill in the gaps between the die 100 and TIVs 605, and encapsulate the die 100 and the TIVs 605. In addition, the encapsulation material further covers the top surfaces of the die 100 and the TIVs 605. The planarizing process is performed on the encapsulation material until top surfaces 103 t of the contacts 103 of the die 100 are exposed. In the case, the top surface 103 t of the contacts 103, top surfaces 608 t of the TIVs 608, top surfaces 609 t of the TIVs 609, and a top surface 108 t of the encapsulant 108 are coplanar after performing the planarizing process. In some embodiments, the planarizing process includes a mechanical grinding process and/or a chemical mechanical polishing (CMP) process. In FIG. 6G, a height 608 h of the TIVs 608 is less than a height 609 of the TIVs 609 after performing the planarizing process.

Referring to FIG. 6H, the RDL structure 132 is then formed on the die 100, the TIVs 605 and the encapsulant 108. A plurality of conductive connectors 138 are formed on and electrically connected to the RDL structure 132. Optionally, the first passive device 110 is formed on and electrically connected to the RDL structure 132. In some embodiments, the RDL structure 132 is referred to as a front side RDL (FSRDL) structure.

Referring to FIG. 6H and FIG. 6I, a structure 60 a illustrated in FIG. 6H is flipped and mounted on the frame 140 by the conductive connectors 138. The carrier C and the de-bonding layer DB are detached from the structure 60 a and then removed. In the case, as shown in FIG. 61 , a top surface DIt of the dielectric layer DI is exposed.

Referring to FIG. 6I and FIG. 6J, the dielectric layer DI is patterned to form a plurality of openings (not shown) by a laser drilling process or a photolithography and etching processes. A plurality of solders 610 are respectively formed in the openings by a solder pasting, a printing process, or a suitable process. Another package (or upper package) 60 c is bonded to a package (or bottom package) 60 b through a plurality of conductive connectors 204 and the solders 610. The arrangement and forming method of the upper package 60 c are similar to the arrangement and forming method of the upper package 10 c illustrated in above embodiments. Thus, details thereof are omitted here. After removing the frame 140, a package structure 60 is accomplished, as shown in FIG. 6J.

In FIG. 6J, the upper package 60 c is formed on the RDL structure (or BSRDL structure) 102, and the BSRDL structure 102 is disposed between the die 100 and the upper package 60 c and between the second passive devices 220 and the upper package 60 c. The upper package 60 c is electrically connected to the second passive devices 220 through the conductive connectors 204 and BSRDL structure 102. In addition, the second passive devices 220 are closer to the upper package 60 c than the first passive device 110. Therefore, the equivalent series resistance (ESR) and/or the equivalent series inductance (ESL) between the upper package 60 c and the second passive devices 220 are decrease. As a result, the second passive devices 220 are able to provide a high quality power distribution network (PDN) and a fast date rate for the high bandwidth memory, such as low power double-data-rate (LPDDR).

FIG. 7A to FIG. 7K are schematic cross-sectional views illustrating a method of manufacturing a package structure according to a seventh embodiment of the disclosure.

Referring to FIG. 7A, a carrier C having a de-bonding layer DB and a dielectric layer DI formed thereon is provided, wherein the de-bonding layer DB is formed between the carrier C and the dielectric layer DI.

Referring to FIG. 7B, a RDL structure 102 is formed on the dielectric layer DI. A plurality of TIVs 105 are formed on the RDL structure 102 by photolithography, plating, and photoresist stripping process.

Referring to FIG. 7C, a die 100, a first passive device 710, and a second passive device 720 are picked and placed on the RDL structure 102 through adhesive layers AD. The die 100 is laterally disposed between the first passive device 710 and the second passive device 720. In the case, a front side 100 a of the die 100, a front side 710 a of the first passive device 710, and a front side 720 a of the second passive device 720 all face up. That is, contacts 103 of the die 100, contacts 713 of the first passive device 710, and contacts 723 of the second passive device 720 face up. In some embodiments, the RDL structure 102 is referred to as a backside RDL (BSRDL) structure.

Referring to FIG. 7D, the encapsulant 108 is formed to laterally encapsulate the die 100, the TIVs 105, the first passive device 710, and the second passive device 720. The encapsulant 108 may be formed by a sequence of an over-molding process and a planarizing process. In the case, top surface 103 t of the contacts 103, top surfaces 105 t of the TIVs 105, a top surface 108 t of the encapsulant 108, top surfaces 713 t of the contacts 713, and top surfaces 715 t of the contacts 715 are coplanar.

Referring to FIG. 7E, a RDL structure 132 is then formed on the die 100, the TIVs 105, the encapsulant 108, the first passive device 710, and the second passive device 720. In some embodiments, the RDL structure 132 is referred to as a front side RDL (FSRDL) structure. The RDL structure 132 may include a plurality of conductive features 134 embedded in a dielectric layer 136. In some embodiments, the conductive features 134 includes a plurality of traces and vias (not shown) stacked alternately. In addition, the conductive features 134 of the RDL structure 132 may include topmost conductive features 135 exposed by the dielectric layer 136. The topmost conductive features 135 may be referred as under-ball metallurgy (UBM) layer for mounting a plurality of conductive connectors 204 (as shown in FIG. 7J).

Referring to FIG. 7E and FIG. 7F, a structure 70 a illustrated in FIG. 7E is flipped and mounted on a de-bonding carrier 740 by the topmost conductive features 135. In some embodiments, the de-bonding carrier 740 may include a frame and a tape being held tightly by the frame. The tape of the de-bonding carrier 740 helps to provide support such that the carrier C and the de-bonding layer DB may be removed from the structure 70 a. After the carrier C and the de-bonding layer DB are detached from the structure 70 a, as shown in FIG. 7F, a top surface DIt of the dielectric layer DI is exposed.

Referring to FIG. 7G, the dielectric layer DI is patterned to form a plurality of openings (not shown) by a laser drilling process or a photolithography and etching processes. The openings (not shown) expose portions of the conductive features 104 of the RDL structure 102. A plurality of solders 702 are respectively formed in the openings (not shown) by a solder pasting or printing process, but the disclosure is not limited thereto. The solders 702 are in contact with the portions of the conductive features 104.

Referring to FIG. 7G and FIG. 7H, a plurality of conductive connectors 704 (also referred to as conductive balls) are formed on and electrically connected to the RDL structure 132 through the solders 702. In some embodiments, the conductive connectors 704 are made of a conductive material with low resistivity, such as Sn, Pb, Ag, Cu, Ni, Bi or an alloy thereof, and are formed by a suitable process such as evaporation, plating, ball drop, screen printing, or a ball mounting process.

Referring to FIG. 7H and FIG. 7I, after the conductive connectors 704 are formed, the structure 70 b illustrated in FIG. 7H is separated from the de-bonding carrier 740 and is flipped upside down again to attach to a frame 140. In the case, the topmost conductive features 135 face up, while the conductive connectors 704 is in contact with the frame 140, as shown in FIG. 7I.

Referring to FIG. 7J and FIG. 7K, another package (or upper package) 70 c is bonded to a bottom package 70 b through a plurality of conductive connectors 204 and the topmost conductive features 135. The arrangement and forming method of the upper package 70 c are similar to the arrangement and forming method of the upper package 10 c illustrated in above embodiments. Thus, details thereof are omitted here. After the upper package 70 c is bonded to the package 70 b, an underfill layer 206 is formed to laterally encapsulate the conductive connectors 204. After the frame 140 is removed, a package structure 70 is accomplished, as shown in FIG. 7K.

In FIG. 7K, the upper package 70 c is formed on the RDL structure (or FSRDL structure) 132, and the FSRDL structure 132 is disposed between the die 100 and the upper package 70 c. The upper package 70 c is electrically connected to the first passive device 710 and the second passive device 720 through the conductive connectors 204 and FSRDL structure 132. In some embodiments, the front side 100 a of the die 100, the front side 710 a of the first passive device 710, and the front side 720 a of the second passive device 720 face toward the upper package 70 c. In the case, the equivalent series resistance (ESR) and/or the equivalent series inductance (ESL) between the upper package 70 c and the first passive device 710 and the second passive device 720 are decrease. As a result, the first passive device 710 and the second passive device 720 are able to provide a high quality power distribution network (PDN) and a fast date rate for the high bandwidth memory, such as low power double-data-rate (LPDDR).

FIG. 8A to FIG. 8L are schematic cross-sectional views illustrating a method of manufacturing a package structure according to an eighth embodiment of the disclosure.

Referring to FIG. 8A, a carrier C having a de-bonding layer DB and a dielectric layer DI formed thereon is provided, wherein the de-bonding layer DB is formed between the carrier C and the dielectric layer DI.

Referring to FIG. 8B, a RDL structure 102 is formed on the dielectric layer DI. A plurality of TIVs 105 are formed on the RDL structure 102 by photolithography, plating, and photoresist stripping process.

Referring to FIG. 8C, the dielectric layer 106 of the RDL structure 102 is patterned to form a plurality of openings (not shown) by a laser drilling process or a photolithography and etching processes. The openings (not shown) expose portions of the conductive features 104 of the RDL structure 102. A plurality of solders 810 are respectively formed in the openings (not shown) by a solder pasting or printing process, but the disclosure is not limited thereto. The second passive devices 220 are picked and placed on the RDL structure 102 through the connectors 218 and the solders 810. In the case, the second passive device 220 includes device regions 213 and pads 216. The device regions 213 of the second passive device 220 face up, while pads 216 of the second passive device 220 face down. In addition, the second passive device 220 further includes a plurality of through semiconductor vias (TSVs) 215 and a plurality of contacts 219. The TSVs 215 penetrates through the substrate 212 and in contact with the interconnect structure 214. The plurality of contacts 219 is disposed on and in contact with the interconnect structure 214.

After the second passive device 220 are mounted on the RDL structure 102, an underfill layer 806 is formed to laterally encapsulate the connectors 218. In some embodiments, the underfill layer 806 may be any acceptable material, such as a polymer, epoxy, molding underfill, or the like. The underfill layer 806 may be formed by a capillary flow process after the second passive devices 220 are attached or may be formed by a suitable deposition method before second passive devices 220 are attached. Although only two second passive devices 220 illustrated in FIG. 8C, the embodiments of the present invention are not limited thereto. In some embodiments, one or more second passive devices 220 are mounted on the RDL structure 102.

Referring to FIG. 8D, the die 100 is picked and placed on the RDL structure 102 through an adhesive layer AD. In the case, the front side 100 a of the die 100 faces up and the die 100 is laterally disposed between the second passive devices 220. The TIVs 105 may laterally surround the die 100 and the second passive devices 220.

Referring to FIG. 8D and FIG. 8E, after the die 100 is placed on the RDL structure 102, an encapsulant 108 is formed to laterally encapsulate the die 100, the second passive devices 220, and the TIVs 105. The encapsulant 108 may be formed by a sequence of an over-molding process and a planarizing process. For example, an encapsulation material (not shown) is formed over the carrier C to fill in the gaps between the die 100 and the second passive devices 220, and between the second passive devices 220 and TIVs 105, and encapsulate the die 100, the second passive devices 220, and the TIVs 105. In addition, the encapsulation material further covers the top surfaces of the die 100, the second passive devices 220, and the TIVs 105. The planarizing process is performed on the encapsulation material until top surfaces 103 t of the contacts 103 of the die 100 and top surfaces 219 t of the contacts 219 are exposed. In the case, the top surfaces 103 t of the contacts 103, the top surfaces 219 t of the contacts 219, top surfaces 105 t of the TIVs 105, and a top surface 108 t of the encapsulant 108 are coplanar after performing the planarizing process. In some embodiments, the planarizing process includes a mechanical grinding process and/or a chemical mechanical polishing (CMP) process.

Referring to FIG. 8F, a RDL structure 132 is then formed on the die 100, the TIVs 105, the encapsulant 108, and the second passive devices 220. The RDL structure 132 may include a plurality of conductive features 134 embedded in a dielectric layer 136. In some embodiments, the conductive features 134 includes a plurality of traces and vias stacked alternately. In addition, the conductive features 134 of the RDL structure 132 may include topmost conductive features 135 exposed by the dielectric layer 136. The topmost conductive features 135 may be referred as under-ball metallurgy (UBM) layer for mounting a plurality of conductive connectors 204 (as shown in FIG. 8K).

Referring to FIG. 8F and FIG. 8G, a structure 80 a illustrated in FIG. 8F is flipped and mounted on a de-bonding carrier 740 by the topmost conductive features 135. In some embodiments, the de-bonding carrier 740 may include a frame and a tape being held tightly by the frame. The tape of the de-bonding carrier 740 helps to provide support such that the carrier C and the de-bonding layer DB may be removed from the structure 80 a. After the carrier C and the de-bonding layer DB are detached from the structure 80 a, as shown in FIG. 8G, a top surface DIt of the dielectric layer DI is exposed.

Referring to FIG. 8H, the dielectric layer DI is patterned to form a plurality of openings (not shown) by a laser drilling process or a photolithography and etching processes. The openings (not shown) expose portions of the conductive features 104 of the RDL structure 102. A plurality of solders 802 are respectively formed in the openings (not shown) by a solder pasting or printing process, but the disclosure is not limited thereto. The solders 802 are in contact with the portions of the conductive features 104.

Referring to FIG. 8H, a plurality of conductive connectors 804 (also referred to as conductive balls) are formed on and electrically connected to the RDL structure 132 through the solders 802. In some embodiments, the conductive connectors 804 are made of a conductive material with low resistivity, such as Sn, Pb, Ag, Cu, Ni, Bi or an alloy thereof, and are formed by a suitable process such as evaporation, plating, ball drop, screen printing, or a ball mounting process.

Referring to FIG. 8I and FIG. 8J, after the conductive connectors 804 are formed, the structure 80 b illustrated in FIG. 81 is separated from the de-bonding carrier 740 and is flipped upside down again to attach to a frame 140. In the case, the topmost conductive features 135 face up, while the conductive connectors 804 is in contact with the frame 140, as shown in FIG. 8J.

Referring to FIG. 8K and FIG. 8L, another package (or upper package) 80 c is bonded to a bottom package 80 b through a plurality of conductive connectors 204 and the topmost conductive features 135. The arrangement and forming method of the upper package 80 c are similar to the arrangement and forming method of the upper package 10 c illustrated in above embodiments. Thus, details thereof are omitted here. After the upper package 80 c is bonded to the package 80 b, an underfill layer 206 is formed to laterally encapsulate the conductive connectors 204. In FIG. 8L, after the frame 140 is removed, a package structure 80 is accomplished.

In FIG. 8L, the arrangement of the package structure 80 are similar to the arrangement of the package structure 70 illustrated in above embodiments. A difference therebetween lies in that the second passive device 220 of the package structure 80 includes the plurality of through semiconductor vias (TSVs) 215. The TSVs 215 penetrates through the substrate 212, so as to electrically connect to the RDL structures 102 and 132.

In the case, the equivalent series resistance (ESR) and/or the equivalent series inductance (ESL) between the upper package 80 c and the first passive device 810 and the second passive device 820 are decrease. As a result, the first passive device 810 and the second passive device 820 are able to provide a high quality power distribution network (PDN) and a fast date rate for the high bandwidth memory, such as low power double-data-rate (LPDDR).

FIG. 9A to FIG. 9J are schematic cross-sectional views illustrating a method of manufacturing a package structure according to a ninth embodiment of the disclosure.

Referring to FIG. 9A, a carrier C having a de-bonding layer DB and a dielectric layer DI formed thereon is provided, wherein the de-bonding layer DB is formed between the carrier C and the dielectric layer DI.

Referring to FIG. 9B, a RDL structure 102 is formed on the dielectric layer DI. A plurality of TIVs 105 are formed on the RDL structure 102 by photolithography, plating, and photoresist stripping process.

Referring to FIG. 9C, a die 100, two passive devices 910 and 920 are picked and placed on the RDL structure 102 through adhesive layers AD. The TIVs 105 are laterally disposed between the die 100 and the passive device 910 (or the passive device 920). In detail, a front side 100 a and contacts 103 of the die 100 face up. A front side 910 a, a device region 913, and contacts 915 of the passive device 910 face down or face toward the RDL structure 102. Similarly, a front side 920 a, a device region 923, and contacts 925 of the passive device 920 face down or face toward the RDL structure 102. In some embodiments, the RDL structure 102 is referred to as a backside RDL (BSRDL) structure.

Referring to FIG. 9D, the encapsulant 108 is formed to laterally encapsulate the die 100, the TIVs 105, the passive devices 910 and 920. The encapsulant 108 may be formed by a sequence of an over-molding process and a planarizing process. In the case, top surface 103 t of the contacts 103, top surfaces 105 t of the TIVs 105, a top surface 108 t of the encapsulant 108, a backside 910 b of the passive device 910, and a backside 920 b of the passive device 920 are coplanar.

Referring to FIG. 9E, a RDL structure 132 is then formed on the die 100, the TIVs 105, the encapsulant 108, the passive devices 910 and 920. In some embodiments, the RDL structure 132 is referred to as a front side RDL (FSRDL) structure. The RDL structure 132 may include a plurality of conductive features 134 embedded in a dielectric layer 136. In some embodiments, the conductive features 134 includes a plurality of traces and vias (not shown) stacked alternately. In addition, the conductive features 134 of the RDL structure 132 may include topmost conductive features 134 a and 134 b exposed by the dielectric layer 136. In detail, the topmost conductive features 134 a may be metal posts or metal pads for connecting to a first passive device 110. The topmost conductive features 134 b may be referred as under-ball metallurgy (UBM) layer for mounting a plurality of conductive connectors 138.

After the RDL structure 132 is formed, the first passive device 110 is formed on the RDL structure 132 through the topmost conductive features 134 a and connectors 112. As shown in FIG. 9E, the connectors 112 are micro-bumps containing copper posts 114 and solder caps 116, but the disclosure is not limited thereto, and other conductive structures such as solder bumps, gold bumps or metallic bumps may also be used as the connectors 112. After the first passive device 110 is mounted on the RDL structure 132, the conductive connectors 138 (also referred to as conductive balls) are formed on the topmost conductive features 134 b (e.g., the UBM layer).

Referring to FIG. 9E and FIG. 9F, a structure 90 a illustrated in FIG. 9E is flipped and mounted on the frame 140 by the conductive connectors 138. The carrier C and the de-bonding layer DB are detached from the structure 90 a and then removed. In the case, as shown in FIG. 9F, a top surface DIt of the dielectric layer DI is exposed. In some embodiments, the de-bonding layer DB (e.g., the LTHC release layer) is irradiated with a UV laser so that the carrier C and the de-bonding layer DB are easily peeled off from the structure 10 a. Nevertheless, the de-bonding process is not limited thereto, and other suitable de-bonding methods may be used in some alternative embodiments.

Referring to FIG. 9F and FIG. 9G, the dielectric layer DI, the RDL structure 102, and the adhesive layer AD are patterned to form a plurality of openings 941 and 942, and the dielectric layer DI is patterned to form a plurality of openings 943. In detail, as shown in FIG. 1G, the openings 941 penetrates through the dielectric layer DI, the RDL structure 102, and the adhesive layer AD to expose one portion of the contacts 915 of the passive device 910. The openings 942 penetrates through the dielectric layer DI, the RDL structure 102, and the adhesive layer AD to expose one portion of the contacts 925 of the passive device 920. The openings 943 penetrates through the dielectric layer DI to expose one portion of the conductive features 104 of the RDL structure 102. In some embodiments, the openings 941, 942, and 943 are formed by a laser drilling process or a photolithography and etching processes. In some alternative embodiments, widths of the openings 941, 942, and 943 may be the same or different.

Referring to FIGS. 9G and 9H, a plurality of solders 951 are respectively formed in the openings 941 to connect to the contacts 915 of the passive device 910. A plurality of solders 952 are respectively formed in the openings 942 to connect to the contacts 925 of the passive device 920. A plurality of solders 953 are respectively formed in the openings 943 to connect to one portion of the conductive features 104 exposed by the openings 943. In some embodiments, the solders 951, 952, and 953 are formed by a solder pasting or printing process, but the disclosure is not limited thereto. In some alternative embodiments, widths of the solders 951, 952, and 953 may be the same or different. After the solders 951, 952, and 953 are formed, a package 90 b is accomplished, as shown in FIG. 9H.

Referring to FIGS. 9H and 9I, another package (or upper package) 90 c is bonded to a bottom package 90 b through a plurality of conductive connectors 204 and the solders 951, 952, and 953. The arrangement and forming method of the upper package 90 c are similar to the arrangement and forming method of the upper package 10 c illustrated in above embodiments. Thus, details thereof are omitted here. After the upper package 90 c is bonded to the bottom package 90 b, an underfill layer 206 is formed to laterally encapsulate the conductive connectors 204. After the frame 140 is removed, a package structure 90 is accomplished, as shown in FIG. 9J.

In FIG. 9J, the front side 910 a of the passive device 910 and the front side 920 a of the passive device 920 both face toward the upper package 90 c. In the case, the equivalent series resistance (ESR) and/or the equivalent series inductance (ESL) between the upper package 90 c and the passive devices 910 and 920 are decrease. As a result, the passive devices 910 and 920 are able to provide a high quality power distribution network (PDN) and a fast date rate for the high bandwidth memory, such as low power double-data-rate (LPDDR).

FIG. 10 is schematic cross-sectional view illustrating a package structure according to a tenth embodiment of the disclosure.

Referring to FIG. 10 , a package structure 90′ of the tenth embodiment is similar to the package structure 90 of the ninth embodiment. A difference therebetween lies in that the conductive connectors 204 are directly mounted on and in contact with the TIVs 105. That is, the bottom package 90 b′ of the tenth embodiment is free of the RDL or BSRDL structure 102. In some embodiments, there is no conductive connector directly over the die 100, as shown in FIG. 10 . In some alternative embodiments, some conductive connectors (not shown) may be directly disposed over the die 100.

In accordance with an embodiment, a method of manufacturing a package structure includes: forming a backside RDL structure on a carrier; forming a plurality of through insulator vias (TIVs) on the backside RDL structure; mounting at least one first passive device on the backside RDL structure, so that the at least one first passive device is disposed between the plurality of TIVs; placing a die on the at least one first passive device, so that the at least one first passive device is vertically sandwiched between the die and the backside RDL structure; forming an encapsulant laterally encapsulating the die, the plurality of TIVs, and the at least one first passive device; forming a front side RDL structure on a front side of the die, the plurality of TIVs, and the encapsulant; releasing the backside RDL structure from the carrier; and mounting a package on the backside RDL structure, wherein the package is electrically connected to the at least one first passive device by a plurality of conductive connectors and a plurality of solders.

In accordance with an embodiment, a method of manufacturing a package structure includes: forming a backside RDL structure on a carrier; mounting a plurality of first passive devices on the backside RDL structure; forming a plurality of through insulator vias (TIVs) on the backside RDL structure; placing a die on the backside RDL structure, so that the die is laterally disposed between the plurality of first passive devices; forming an encapsulant laterally encapsulating the die, the plurality of TIVs, and the plurality of first passive devices; forming a front side RDL structure on a front side of the die, the plurality of TIVs, and the encapsulant; releasing the backside RDL structure from the carrier; and mounting a package on the backside RDL structure, wherein the package is electrically connected to the plurality of first passive devices by a plurality of conductive connectors and a plurality of solders.

In accordance with an embodiment, a method of manufacturing a package structure includes: forming a backside RDL structure on a carrier; forming a plurality of through insulator vias (TIVs) on the backside RDL structure; placing a die and a plurality of passive devices on the backside RDL structure, so that the plurality of passive devices are laterally disposed between the plurality of TIVs, and the die and is laterally disposed between the plurality of passive devices; forming an encapsulant laterally encapsulating the die, the plurality of TIVs, and the plurality of passive devices; forming a front side RDL structure on a front side of the die, the plurality of TIVs, the plurality of passive devices, and the encapsulant; releasing the backside RDL structure from the carrier; and mounting a package on the backside RDL structure, wherein the package is electrically connected to the plurality of passive devices by a plurality of conductive connectors.

The foregoing outlines features of several embodiments so that those skilled in the art may better understand the aspects of the disclosure. Those skilled in the art should appreciate that they may readily use the disclosure as a basis for designing or modifying other processes and structures for carrying out the same purposes and/or achieving the same advantages of the embodiments introduced herein. Those skilled in the art should also realize that such equivalent constructions do not depart from the spirit and scope of the disclosure, and that they may make various changes, substitutions, and alterations herein without departing from the spirit and scope of the disclosure. 

What is claimed is:
 1. A method of manufacturing a package structure, comprising: forming a backside RDL structure on a carrier; forming a plurality of through insulator vias (TIVs) on the backside RDL structure; mounting at least one first passive device on the backside RDL structure, so that the at least one first passive device is disposed between the plurality of TIVs; placing a die on the at least one first passive device, so that the at least one first passive device is vertically sandwiched between the die and the backside RDL structure; forming an encapsulant laterally encapsulating the die, the plurality of TIVs, and the at least one first passive device; forming a front side RDL structure on a front side of the die, the plurality of TIVs, and the encapsulant; releasing the backside RDL structure from the carrier; and mounting a package on the backside RDL structure, wherein the package is electrically connected to the at least one first passive device by a plurality of conductive connectors and a plurality of solders.
 2. The method of claim 1, wherein the forming the plurality of TIVs is prior to the mounting the at least one first passive device.
 3. The method of claim 1, wherein the at least one first passive device and the die are adhered together through an adhesive layer and in a back-to-back configuration.
 4. The method of claim 1, wherein the at least one first passive device comprises two passive components separated from each other.
 5. The method of claim 1, further comprising: forming a second passive device on the front side RDL structure, wherein the forming the second passive device is after the mounting the at least one first passive device.
 6. The method of claim 1, wherein the forming the backside RDL structure is prior to the forming the front side RDL structure.
 7. The method of claim 1, wherein the front side of the die and a front side of the at least one first passive device face toward different directions.
 8. A method of manufacturing a package structure, comprising: forming a backside RDL structure on a carrier; mounting a plurality of first passive devices on the backside RDL structure; forming a plurality of through insulator vias (TIVs) on the backside RDL structure; placing a die on the backside RDL structure, so that the die is laterally disposed between the plurality of first passive devices; forming an encapsulant laterally encapsulating the die, the plurality of TIVs, and the plurality of first passive devices; forming a front side RDL structure on a front side of the die, the plurality of TIVs, and the encapsulant; releasing the backside RDL structure from the carrier; and mounting a package on the backside RDL structure, wherein the package is electrically connected to the plurality of first passive devices by a plurality of conductive connectors and a plurality of solders.
 9. The method of claim 8, wherein forming the plurality of TIVs comprises: forming a plurality of first copper posts directly on the plurality of first passive devices; and forming a plurality of second copper posts directly on the backside RDL structure, wherein the plurality of first copper posts has a top surface higher than a top surface of the plurality of second copper posts.
 10. The method of claim 9, wherein the plurality of first copper posts and the plurality of second copper posts are formed simultaneously.
 11. The method of claim 9, wherein the plurality of first copper posts are vertically sandwiched between the plurality of first passive devices and the front side RDL structure.
 12. The method of claim 8, wherein one of the plurality of first passive devices has a substrate and a plurality of through semiconductor vias (TSVs) penetrating through the substrate.
 13. The method of claim 8, wherein the forming the backside RDL structure is prior to the forming the front side RDL structure.
 14. The method of claim 8, further comprising: forming a second passive device on the front side RDL structure, wherein the forming the second passive device is after the mounting the plurality of first passive devices.
 15. A method of manufacturing a package structure, comprising: forming a backside RDL structure on a carrier; forming a plurality of through insulator vias (TIVs) on the backside RDL structure; placing a die and a plurality of passive devices on the backside RDL structure, so that the plurality of passive devices are laterally disposed between the plurality of TIVs, and the die and is laterally disposed between the plurality of passive devices; forming an encapsulant laterally encapsulating the die, the plurality of TIVs, and the plurality of passive devices; forming a front side RDL structure on a front side of the die, the plurality of TIVs, the plurality of passive devices, and the encapsulant; releasing the backside RDL structure from the carrier; and mounting a package on the backside RDL structure, wherein the package is electrically connected to the plurality of passive devices by a plurality of conductive connectors.
 16. The method of claim 15, wherein the front side of the die and a front side of the plurality of passive devices face toward the same direction.
 17. The method of claim 15, wherein one of the plurality of passive devices has a substrate and a plurality of through semiconductor vias (TSVs) penetrating through the substrate.
 18. The method of claim 15, wherein the forming the backside RDL structure is prior to the forming the front side RDL structure.
 19. The method of claim 15, wherein the forming the plurality of TIVs is prior to the placing the die and the plurality of passive devices.
 20. The method of claim 15, wherein the forming the encapsulant comprises: forming an encapsulation material over the backside RDL structure to fill in gaps between the die, the plurality of passive devices, and plurality of TIVs, wherein the encapsulation material further covers top surfaces of the die, the plurality of passive devices, and plurality of TIVs; and performing a planarizing process to remove a portion of the encapsulation material and expose the top surfaces of the die, the plurality of passive devices, and plurality of TIVs, so that the top surfaces of the die, the plurality of passive devices, and plurality of TIVs are level to each other. 